<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>Socket.IO chat</title>
    <style>
      body { margin: 0; padding-bottom: 3rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }

      #form { background: rgba(0, 0, 0, 0.15); padding: 0.25rem; position: fixed; bottom: 0; left: 0; right: 0; display: flex; height: 3rem; box-sizing: border-box; backdrop-filter: blur(10px); }
      #input { border: none; padding: 0 1rem; flex-grow: 1; border-radius: 2rem; margin: 0.25rem; }
      #input:focus { outline: none; }
      #form > button { background: #333; border: none; padding: 0 1rem; margin: 0.25rem; border-radius: 3px; outline: none; color: #fff; }

      #messages { list-style-type: none; margin: 0; padding: 0; }
      #messages > li { padding: 0.5rem 1rem; }
      #messages > li:nth-child(odd) { background: #efefef; }
    </style>
  </head>
  <body>
    <ul id="messages"></ul>
    <form id="form" action="">
      <input id="input" autocomplete="off" /><button>Send</button>
    </form>
  </body>
  <script src="/socket.io/socket.io.js"></script>
  <script>
    const socket = io();
  
    const form = document.getElementById('form');
    const input = document.getElementById('input');
    const messages = document.getElementById('messages');
  
    form.addEventListener('submit', (e) => {
      e.preventDefault();
      if (input.value) {

        const timestamp = Date.now();
        const msgId = 'id'  +timestamp.toString();
        const msg = {
            from: '553908555964264448',
            to: '357225782',
            // to: '123456',
            content : input.value,
            createTime: timestamp,
            fromType: 'assistant',
            type: 'text',
            messageId: msgId
        }
        
        socket.timeout(10000).emit('private message', msg, (err, response) => {
            if (err) {
                console.log('error: ' + err);
            } else {
                console.log('send status: ' +response.status);
                const item = document.createElement('li');
                item.textContent = msg.content + ' server callback: ' + response.status;
                messages.appendChild(item);
                window.scrollTo(0, document.body.scrollHeight);
            }
        });
        /*
        const item = document.createElement('li');
        item.textContent = input.value;
        messages.appendChild(item);
        window.scrollTo(0, document.body.scrollHeight);
        // socket.emit('chat message', input.value);
        */
        input.value = '';
      }
    });

    setTimeout(() => {
        socket.emit('user info', {userId: '553908555964264448'});
    }, 2000);


    socket.on('private message', (msg, callback) => {
      const item = document.createElement('li');
      item.textContent = msg.content;
      messages.appendChild(item);
      window.scrollTo(0, document.body.scrollHeight);
      callback({
        status: 'ok from web'
      });
    });

  </script>
</html>